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Polarizing plate with phase difference layers and image display device

A technology of image display device and phase difference layer, which is applied in polarizing elements, optics, instruments, etc., and can solve problems such as insufficient brightness and large color shift

Pending Publication Date: 2021-10-22
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technologies have problems that the luminance in the oblique direction is not small enough when displaying black and the color shift in the oblique direction is large.

Method used

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  • Polarizing plate with phase difference layers and image display device
  • Polarizing plate with phase difference layers and image display device
  • Polarizing plate with phase difference layers and image display device

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Experimental program
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Embodiment 1

[0125] 1. Fabrication of polarizers

[0126] 1-1. Production of polarizer

[0127] As the thermoplastic resin substrate, a long amorphous isophthalic acid-copolymerized polyethylene terephthalate film (thickness: 100 μm) having a water absorption rate of 0.75% and a Tg of about 75° C. was used. Corona treatment was performed on one side of the resin substrate.

[0128] PVA prepared by mixing polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., product name "GOHSEFIMER Z410") at a ratio of 9:1 13 parts by mass of potassium iodide was added to 100 parts by mass of the resin, and the obtained product was dissolved in water to prepare an aqueous PVA solution (coating solution).

[0129] The above-mentioned PVA aqueous solution was applied to the corona-treated surface of the resin substrate and dried at 60° C. to form a PVA-based resin layer with a thickness of ...

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Abstract

The invention provides a polarizing plate with phase difference layers and an image display device. Provided is a polarizing plate with phase difference layers capable of realizing an image display device in which the brightness in the tilt direction during black display is small and the color shift in the tilt direction is small. The polarizing plate with phase difference layers according to the present invention is provided with: a polarizing sheet including a polarizer; a first phase difference layer which is disposed adjacent to the polarizing sheet and which has refractive index characteristics exhibiting a relationship of nx > ny = nz; and a second phase difference layer which is disposed adjacent to the first phase difference layer, and which has refractive index characteristics showing a relationship of nz > nx > ny. The absorption axis of the polarizer is substantially orthogonal to the slow axis of the first phase difference layer, and the absorption axis of the polarizer is substantially parallel to the slow axis of the second phase difference layer.

Description

technical field [0001] The present invention relates to a polarizer with retardation layer and an image display device. Background technique [0002] In an image display device (for example, a liquid crystal display device), various optical films that combine a polarizer and a retardation film are generally used for optical compensation. A circular polarizing plate as one of the above optical films can generally be produced by combining a polarizer with a λ / 4 plate. However, a λ / 4 plate generally exhibits a so-called "positive wavelength dispersion characteristic", that is, a characteristic in which the retardation value increases as the wavelength becomes shorter, and its wavelength dispersion characteristic is generally large. Therefore, there is a problem that desired optical characteristics (for example, function as a λ / 4 plate) cannot be exhibited in a wide wavelength range. In order to avoid such problems, retardation films exhibiting so-called "reverse dispersion ch...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02F1/1335
CPCG02B5/3083G02F1/133528G02B5/3033G02F1/13363
Inventor 有贺草平
Owner NITTO DENKO CORP
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